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This patch accompanies the RFC posted here: http://lists.llvm.org/pipermail/llvm-dev/2018-October/127239.html This patch adds a new CallBr IR instruction to support asm-goto inline assembly like gcc as used by the linux kernel. This instruction is both a call instruction and a terminator instruction with multiple successors. Only inline assembly usage is supported today. This also adds a new INLINEASM_BR opcode to SelectionDAG and MachineIR to represent an INLINEASM block that is also considered a terminator instruction. There will likely be more bug fixes and optimizations to follow this, but we felt it had reached a point where we would like to switch to an incremental development model. Patch by Craig Topper, Alexander Ivchenko, Mikhail Dvoretckii Differential Revision: https://reviews.llvm.org/D53765 llvm-svn: 353563
15 lines
428 B
LLVM
15 lines
428 B
LLVM
; RUN: llvm-dis < %s.bc | FileCheck %s
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; callbr.ll.bc was generated by passing this file to llvm-as.
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define i32 @test_asm_goto(i32 %x){
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entry:
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; CHECK: callbr void asm "", "r,X"(i32 %x, i8* blockaddress(@test_asm_goto, %fail))
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; CHECK-NEXT: to label %normal [label %fail]
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callbr void asm "", "r,X"(i32 %x, i8* blockaddress(@test_asm_goto, %fail)) to label %normal [label %fail]
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normal:
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ret i32 1
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fail:
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ret i32 0
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}
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